I'm having an issue with mp4 audio

[Derek]

So first things first I really love this program for what it does and especially because it has a ton of settings to tinker with.

Now onto the problem I've been trying to export a video and I set the audio option to passthrough all. Then I wait for the video to export and the audio's not working! I would really appreciate help fixing this issue thanks for your time!

Oh also if you need me to send you all of the settings I altered in the form of screenshot I can it's not much

It is possible that the mp4 container doesn't support the audio format of the original video. One of the many reasons why I try (if possible) to encode anything to mkv.

If possible, please tell me, what is the format of the audio in your original video.